I bought my head unit from crutchfield, and it wasn't more expensive than other places........I looked around before buying the head unit from crutchfield, and it wasn't much cheaper anywhere else.....maybe 25 bucks more at crutchfield, but you get all the neccessary hardware and adapter to hook it up to your vehicle, and it was free shipping on mine. On another site, it might be slighly cheaper, but you still have to buy the hardware and stuff, and probably pay for shipping too, so in the end, its not any cheaper than crutchfield. (there are a few exceptions though). Plus you get technical support from them as long as you own the equipment.
2004 Ford Ranger
3.0 5spd. 4.10 gears 6" lift w/ 35's